Be sure to add me to your favorites list Good Reproduction / Copy of the Roland Service Manual Notes for the 80's Vintage Roland D-550 Synthesizer Module. This is a good reproduction / copy of the vintage Roland service manual for the classic late 80's Roland D550 synthesizer module. It is very good condition and complete. This belonged to a professional repair person and for some reason, they cut the very top of the booklet off. Even so, it would be very helpful if you needed to work on your D550. This booklet has specs, dis assembly, circuit boards, parts lists, schematics and much more. Great copy of the original Roland document. This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. Thank you so much for looking! Check out my Store!